build(deps): bump github.com/pion/webrtc/v4 from 4.1.6 to 4.2.1

[dependabot]

Bumps github.com/pion/webrtc/v4 from 4.1.6 to 4.2.1.

Release notes

Sourced from github.com/pion/webrtc/v4's releases.

v4.2.1

Changelog

• a5ce25266ea8ca336f04dc9775d0809024b531f6 Assert no repair after stop
• 48f7ac7c64851ad80cdbffcbc587fdb5651b23c1 Check for closed receiver before setting up rid

v4.2.0

We are pleased to announce our final and largest release of 2025. This release includes contributions from 69 contributors.

This release also marks a new era for Pion. Going forward, we will publish releases on a regular schedule.

Major new features

RACK

• We are happy to announce that SCTP now includes a RACK implementation, enabled by default. This work is included in pion/sctp#390 and pion/sctp#438, with a reported 71% improvement in maximum throughput and 27% better latency.

ICE Renomination

• Pion now supports ICE renomination It was added in pion/ice#822 and pion/ice#799, and integrated into WebRTC in pion/webrtc#3306. It can be enabled via the SettingEngine.

// For advanced use with a custom generator and interval.
se := webrtc.SettingEngine{}
interval := 2 * time.Second
customGen := func() uint32 { return uint32(time.Now().UnixNano()) } // example
if err := se.SetICERenomination(
webrtc.WithRenominationGenerator(customGen),
webrtc.WithRenominationInterval(interval),
); err != nil {
log.Println(err)
}

Cryptex

• Pion now supports Cryptex, enabling full encryption of RTP headers and header extensions. This work is included in pion/srtp#324 and pion/sdp#213.

FlexFEC

• FlexFEC has been added, is stable, and is ready for production use. See pion/interceptor#333, pion/webrtc#3075, pion/interceptor#330, pion/interceptor#344, and pion/interceptor#383.

ICEAddressRewriteRule

• Pion’s NAT 1:1 API is now deprecated. After years of use, it no longer fits modern deployment models. This change is implemented in pion/ice#834 and pion/webrtc#3309.

The new API, SetICEAddressRewriteRules(rules ...ICEAddressRewriteRule) error, rewrites the IP addresses embedded in gathered ICE candidates.

Rule fields (high level):

... (truncated)

Commits

• a5ce252 Assert no repair after stop
• 48f7ac7 Check for closed receiver before setting up rid
• 45fa3ed Update module github.com/pion/sctp to v1.9.0
• b997b87 Update CI configs to v0.11.36
• 39dee98 Undo OGG API deprecation
• d8828d6 Advertise ICE renomination option
• 0f4f3a0 Update module github.com/pion/sdp/v3 to v3.0.17
• f2fe992 Update module github.com/pion/rtp to v1.8.27
• 7298add Add an option to include SEI NALs for H264/H265 (#3313)
• cf04e20 Add nohost gather policy
• Additional commits viewable in compare view

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